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RT WeAreOpenCoop: Our members have thought and tinkered for organizations like mozilla, creativecommons, greenpeace, bbc and many more. See what our #coop can do for you - Schedule a thinkathon
https://weareopen.coop/thinkathon/
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!